angel_09,
in your diagram, the injected signal (amplifier ?) comes from below, underground. does it mean that you have to dig and place the amplifier underground first for the target to be amplified? or the amplifier comes from the surface? can you elaborate a few sir, for us to have a few ideas on how it works.... at the least, your project is very very good sir, i hope you succeed in amplifying this metal signals from below the earth.... when you say of electronics detector, you mean anything electronics detector? be it EM, MAGNETICS or GPR ? if it is, then again your project, is very very very good. I hope you have something that inventors did not invent yet.
Peace!